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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc18eb932fd180b819586854deab7c6d27e6032218fe9acbdbb38b40a3ba589b' 
  AND token = 'TDExFLiuSwpxv3BdetEoEjP9dkcyBNUptI8JTlgET28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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