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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20faea122e2c6676453fe5fe4edcb9356766a371b6f0289a5384439394900e3' 
  AND token = 'JjrXfqO+KFvRW2aaAqHkzhqDbc0qYHwxfD/R+yquW0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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