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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba4e66e011b4fd974190b27f56843798d7898b56555e792a79499790db0933a' 
  AND token = '2W+mTZ+Le5JKrxO5V7nN5zp4PJPeT0XUBgk2OvEoqn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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