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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2f49ec2b421f13d74e29027d357311bb16f7ebaac7ddbec87c1b8fb7a2bea9' 
  AND token = 'A5Aj4V9rV8SHujY407Rwqfrfb2VR8p31ojsktonv2J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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