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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973ad8203b5a35fcd54ba2348626e9280d0e7941e5221424ff795c926a2dcec8' 
  AND token = 'SaZE0H/AIb+Ikx8Ipl2R8bgHU3CJUBLyuTMCRZnjzNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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