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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69844853b35b0ebeb91b97f87cda3dfec4cdad0e059f76410e8842b3f23c868' 
  AND token = 'tjCFDrMhxfR/7NFOHJi09vuMY5Dthul1CFPz3mf/hw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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