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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1175b4cb74c849778fccbd88d9571076cc2a065c7357394cf2121cac982939ce' 
  AND token = '5bBiK3/Rft72JuhSdCPe1ahi9cXJq2aAimoMRlgeXbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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