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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98cfa1c8a64bd9bfa8e653cf1c240fa9845ed8b11df558c128f85f24f61a0b7' 
  AND token = '1cPoE/lVtEsAAFGvnn/6Rq/xQW/yizPR69s88/OZOPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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