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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518ecf273d3671a26f5ea81e7fef2d35b66b067cb57e8853c59299a3d1271f76' 
  AND token = 'PAL+gi2AQgUe/LQo3hV+AKw2oaoRMVLHUC6yA7l+6vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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