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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9013ec2982c391f75299787d9f32de03528b23f570c9f8ea3e3dc2a963305c9' 
  AND token = 'L13Xni7gZ66h3QorJnhPluIOIrE9hC9cr8+6aw30k0s=' 
  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"
    }
  }
}