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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e54418e2c6703c0489c5454b50419720a37039e14dfebc981a200e1c26b9ecb' 
  AND token = 'vgHoiavXz8BMABLKpb7lE8fnvcv2eySAggCbGg8Rdlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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