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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1177c0396aa86eba060ad16c8a420bd941dbea9832fd833d0121b807fb3312c' 
  AND token = 'CbBOW7k1h27cCC1aOcLT7U269Tjwji5X5vhkVOBnBi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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