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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6be20d54c3be1da95d144be50cd6a25b01f2d1c8ea3b22b411f35d5d44c86a2' 
  AND token = 'qpOp9XNjfyBIBrzoHBUaIFbE+J87RwHeDKumRYgcopI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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