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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1de2ecb9270cad58205c8e4ea253ab335d4f7b236e3ceba17654b928462155' 
  AND token = 'xOEVzglHEs9OwWIsjKLXYRccZCekG95rCX+1P2mIlSc=' 
  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"
    }
  }
}