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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c770ad758c4b3ffa8c7f3bffcf3947e939974c3916e811dcdb3723a60cc92e10' 
  AND token = 'vdgaF8QIgM5xYysMi+zJDA9DE2O1NkJeNmwsyHtVUXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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