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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc46b3b97e55a4f6fa2d881bbbd9682089115f10c39d6a2be03e9cac4b5a2cb0' 
  AND token = 'hEWaI18byN5kw/FIerFey8sEBG6tdG2pOYdPNjT6klc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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