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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724e9060de549f2c5c31fc4556d87c7546c9dd0ce85be23304a52bb88733c23c' 
  AND token = 'b5xAUlrlEofzYazgaNVWOUn8i0iGbl4TsEw91mtakWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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