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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaab3809ec5c65cf881cedca560e5e36ad1236f264d9eb079849dafb17c335ac' 
  AND token = '2U3Pjq6LiNQDHfhL0RCqHCz+RzneNMghyZT9EydeeR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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