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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b345dff3a52c48d77c7d8e8038029ff6e750e2c3b004175f55a9829dc679ab0' 
  AND token = 'uui2DIJ6Ryb5wuvzOcMtJbIqn1LlO9fQyAiv+B+8M64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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