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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c7233c54239c735082fbb542b9ce79617fd15d41e6571f55e10efbead4a61f' 
  AND token = 'k2D9c3YgUj7dUaNvhrnc0F6lbu9lnH1i/QfS0VO6eto=' 
  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"
    }
  }
}