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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d7d61736bf5d6c35b6001e49a0225d104b3a3f4636c39fd9aedb61c7a2a4c7' 
  AND token = 'thTiqv6lYItCNylBcxBufwGc6Y/+YN1gS3218Cfw0Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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