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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae0ec72602b7d9512f7c09b1b35c371cb220567194e4fa346abcbd40832f4f9' 
  AND token = 'Qmkg9xdlJTFkBjkYzyqfs0Xg5SMBcFR6T/DlEGp1Mvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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