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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02970a9ad969776d1c8ff3a422577baeccf97317b10c360642bfca4ed6676989' 
  AND token = 'j8CGFx/Aqo4Us3AIrN/t1j3bMhtzypLoHug/xbaHtQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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