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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7b6884bf465b7e29d8020117198384a3e519ad00d0df655a4df2a167253791' 
  AND token = 'PwjE8+eE66pBNBGp/M1Of6Av0OlfXF9pALLAw6zeMD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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