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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f13c36fb30b88eb70829bc010289249c2bf8bc99273f20fbfbc7c72698fe91c' 
  AND token = 'qGz13HZ1/RQ6vYK92860i/+XD9OQ2vyi3zAdxqu10L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}