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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd0e108d618b4893f40d2a825938bd7231ab123e37fe90b3551b4a9abe1c9ff' 
  AND token = '9HBNMC9dzaC6eTT7Zlqg/BN5FADZQ1QdV6aRCDgvdIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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