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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2f10eac16b09f4d8417d2472fc5d5b3bc0cd13475861e37eb371e99419e2ac' 
  AND token = 'Er/cqlFdLnpg5Z33iMjdsLbcOyFLS9FqQiAoVnlV2sY=' 
  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"
    }
  }
}