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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd806b6a7bd57f1be0582b7659c916d95a26057c2a9d55a7a6ab2d7df0ebe4f70' 
  AND token = '0Q6K4/+vcYo+h1lJW3IU6QKC68hS3yk9jgoGGOF2GHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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