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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf2c51e10c22143b31780dab164fcf0e6eabd9461547701e2b41795566116ee' 
  AND token = '2xx2riW9RhNOAS8/UsJjsJXChpQcJMce2Mka/FBUZlM=' 
  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"
    }
  }
}