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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e442b941832b8348a29bd635e941f466532f49980e30b061485ee06207f5e1' 
  AND token = '9icPo64piBJC0E4w4h5LurUgPPV/wbbclrh7WSU6ITM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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