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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9376d07bad0f4e95a7d17c383b363b752db014679cc7b266051ca3b17a8f1d5' 
  AND token = 'PHxkam2rLT2iDun5P/djcn5j6ppOLvx8mvWRS0lgRDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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