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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bf1ab8b8da68a339d7dee4e8454832686116a7323cac035935aad3158aee0f' 
  AND token = 'gwIb+r1mdkQD/C5SOT3BGcX0TdYApNUGEitLO1BYDWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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