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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2303c0f707d694734852f9ad96b7eb74c2b9af9f3ab5f8ade2ad6014f376ff8d' 
  AND token = 'mpMpAXQx8/yO5Tf0iDnqw6N6njOafIiBlAUVPuqeprw=' 
  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"
    }
  }
}