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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2c32abc9cdcfff451028fc4464b71ce0ff5df85e647925cdeaf8314850d7c3' 
  AND token = '9kTfsOBePdC71Izipn94ky0mF8kNWj/sPt3C57Wi/ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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