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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e004069cf48b2c33f17fcee69955e7d3390844dcc790968fb095bf7e143b54' 
  AND token = 'fP7VdJ50P7sr5mGfLx6+TUXeG5SRQVtxTtPTT+Tdyf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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