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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5957edc6bac53bd69894f9681106e9e5001ae7801894489d0d0e213305e038b' 
  AND token = 'SMHhVsqXx0x7U/U5SuixzQ+tA6aSRF204KjMXFfzVI0=' 
  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"
    }
  }
}