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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b43d304c03742547a5eb935357557816f4492f49c61c3d105932aeaea46c5d5' 
  AND token = 'R+K+LC7DsIGRXlJbwAn2Z1pIRzZMiIg0ynh9IBUEIOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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