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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9f171383cbd078849d2e922dcaf4738ac0f548e0f698dee9e566131989b69a' 
  AND token = 'Tmzirs3NBP3ynvBL0aKtezSmz6WmpqemrBTOeV/0Vj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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