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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb44e4ca24738059ec91d3ee027acd25a669cb54ea0a2cfd3055ea20da01450' 
  AND token = '6bR4WQQQvLsRBfymHLLg86MW8rrRcg4M1a/Rkzz0XsY=' 
  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"
    }
  }
}