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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a807e70e0243444068f277e71293e52b8b3ef5b2e8e1166e4b61e7f51a43fb' 
  AND token = 'c4rPqzN4bSjcllSr9cGCH1T0wBlkMUnnnqV/UiVUweg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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