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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b5170d4ff0469a5bffab218653a03bf72fedc6b7b5bea2c10d5fa13e87fb71' 
  AND token = 'vOI7WodItADkGwRCbKZq1Nln/6u/4a0NcPUttB3iE3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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