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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e28223d29d19629aaf593c0470d2be4de7f8ba01fc865b8fcffbe32018c6fe' 
  AND token = 'riA5bM02oDcV6Iu9g3OdrVcs3WmjPYmugtfS8l8J2BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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