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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199aece0d09bcb696d50e0430d97e981f09c3705f87a9e977af78d21f4c2ba93' 
  AND token = 'wHx1O/jY0NItPMdEcPFxigIQDHaBUO/F5lYbrJ+o3Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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