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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66526eb5dce29d0d693e1b7a3880f06cc6cb8eb0cdc47464cfd6d3d79fbcbbe' 
  AND token = 'G8wM4mer4s2iQjqRWikm1JzhHFWfTUc6iZG38ezKLHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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