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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a485e91a2d63337c85e20a0e9f0cbbfb6909b450a72a9652474267d8020e3463' 
  AND token = 'rOTEEES7F4hK6PHsNJuIdpjJdduDT2TTQx4ju5weioI=' 
  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"
    }
  }
}