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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c8c6670f7dc9f1cdcc7b524e22344dd8af8b970c740c6d007b576b370734e6' 
  AND token = 'plnQC7HKvfurz97XUtnrIN+DSjFv+nLjCkwZpSqowu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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