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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05c41a32117d0d019983bd4bf49b7a04eae5062c662b49333b9ba63b96d5c9b' 
  AND token = '94SEr0mfjMBKzxHzKUAepQ8X3t5VnVAPJuc1Y+S9hhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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