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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdedf4ca02450f6d6e62c655014f66713301418c6fed249692d4e6b43005a31' 
  AND token = 'dPu/7dBSULKjM0bVimJf6UBhy/QTa0q4h3myM0d2k4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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