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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614ecf049d2915a89133f15fa7a5ebe9881e47940d9d81f1498829ef8fb10abe' 
  AND token = 'dWGAS2d8ArZ/TmUb2xX91crent2tS3K6P4WhINmu1Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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