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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040a92f71bf48ad8229d64d1d4564a8eb157eae6ceb712af7517227f488d2770' 
  AND token = '0wAfxkt/PXqSofZdCvdhd6I8smwozrcMJ1poKfkbKzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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