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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0958a44921f0505b889ad9a056e8dca08eb1f1d64980e58cec0b454cb4d7470' 
  AND token = 'JhCE0yUHGyzpBf44/AYjOyjdwD9kbKyvsks/ejsKJdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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