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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bd6e309cda8c08cda1d6ca8de3329beadfa8dc87208202d27d284767a90509' 
  AND token = 'r+1n0Zlly0e4CyOiNnjwJzuIj6b9m/EF9eQQQEai91M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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