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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f67b2fb3c26f973db5e21e293643ded052b6947b4b0488f03e1557c21543c10' 
  AND token = 'oSW3SYZ8kNI9A9N31yAjXFtqPELaG/s8w5Tu8vg3zfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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