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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bad79b5a85a8c0c685d878665d33ed24d7d5ec67c3c7efb4c56a2585fffb87a' 
  AND token = 'mMGVEfnuu1qR2CcupzmDr1hvSvi7K/ET00vMOA2sHMc=' 
  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"
    }
  }
}