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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ede205f634d1d7283aa1e19ac7166ae12c32a3b7a2d5e97e1bc0952a47156a' 
  AND token = '94NUwWCfYLCganLMoOYHVtKbI7a8+Lnqa0KpRmcpzxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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