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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4c6ae761434fc72b1e73b64267c727bfbaaed1b755ef4c05a3031a4bce6b2d' 
  AND token = '6RCCwENsgC1n8hvBpBUDEBbvgZBATN9CUkZdKMc3nXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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