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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4196ce0a0fee6db5e4c583ae5fbd1b9451e648a3a3f558660562697a88b2018' 
  AND token = 'mu6e+fpfuap5PjUBs/yPbGpBolaDDQFi1ZHYRc8JK18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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