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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8835a5f45e23fac5930e42367b57c53aa28b7dee8b5044c17b0155fa61db3d' 
  AND token = 'NRDZlV5yYISi5anMana7twgaWHdSr/wx20ZnWpNz4L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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